| Title: |
Effect of convective transport in edge and scrape-off-layer plasmas of ADITYA-U tokamak |
| Authors: |
Ritu Dey; M. B. Chowdhuri; Joydeep Ghosh; Tanmay M. Macwan; Kaushlender Singh; H. Raj; R. L. Tanna; R. Manchanda; Deepti Sharma; T. D. Rognlien |
| Source: |
Scientific Reports, Vol 16, Iss 1, Pp 1-14 (2025) |
| Publisher Information: |
Nature Portfolio |
| Publication Year: |
2025 |
| Collection: |
Directory of Open Access Journals: DOAJ Articles |
| Subject Terms: |
Medicine; Science |
| Description: |
The 2-D edge plasma fluid transport code, UEDGE has been used to simulate the edge and scrape-off layer regions of circular limiter plasmas of ADITYA-U. The computational mesh defining the limiter geometry of ADITYA-U has been introduced in the UEDGE code through an in-house developed routine. It has successfully been integrated with the UEDGE code and the measured radial profile of electron density ( $$n_e$$ ) in the edge region is modelled using the simulations. The plasma discharge for the present study has plasma current $$\text {I}_{P}$$ $$\sim$$ 130 kA, duration $$\sim$$ 150 ms, chord-averaged electron density $$\sim$$ 1.3 $$\times$$ $$10^{19}$$ $$\text {m}^{-3}$$ , and central electron temperature $$\sim$$ 270 eV has been observed. The maximum toroidal magnetic field is $$\sim$$ 1.2 T. It has been found that an inward convective velocity, $$\text {v}_{conv}$$ $$\sim$$ 1.5 m/s is required in addition to the constant perpendicular diffusion coefficient, $$\text {D}_{\perp }$$ $$\sim$$ 0.2 $$\text {m}^2$$ /s to adequately match the measured $$\text {n}_e$$ profile in typical discharges of ADITYA-U. The value of $$\text {D}_{\perp }$$ $$\sim$$ 0.2 $$\text {m}^2$$ /s is found to lie between the estimated neoclassical diffusivity and Bohm diffusivity. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://doi.org/10.1038/s41598-025-31182-z; https://doaj.org/toc/2045-2322; https://doaj.org/article/bb2d9fe03ebe417ca80d97299a462eac |
| DOI: |
10.1038/s41598-025-31182-z |
| Availability: |
https://doi.org/10.1038/s41598-025-31182-z; https://doaj.org/article/bb2d9fe03ebe417ca80d97299a462eac |
| Accession Number: |
edsbas.71994 |
| Database: |
BASE |